1. Introduction
Thank you for purchasing the MEGUO A66 Portable Bluetooth Speaker. This manual provides essential information for setting up, operating, and maintaining your speaker. Please read it carefully before use and retain it for future reference.
The MEGUO A66 is a versatile 5W portable wireless speaker designed to deliver clear sound with multiple playing modes, compatible with cellphones and PCs for both home and outdoor use.
2. Key Features
- Clear Sound Output: Equipped with a 5W speaker and two passive bass diaphragms for enhanced audio quality.
- Compact and Portable Design: Lightweight (under 8 ounces) and compact (4.5" long, 3.15" max diameter), includes a lanyard for easy carrying during hiking, jogging, biking, camping, or traveling.
- Extended Playtime: Up to 10 hours of music playback at 2/3 volume (without light). Actual playtime may vary based on music type, volume, and light usage.
- Multiple Playing Modes: Supports Bluetooth, TF card (WAV/MP3 format), USB flash-disk, and 3.5mm AUX input.
- True Wireless Stereo (TWS): Connect two A66 speakers wirelessly for a combined 10W louder stereo sound experience.
- Colorful Light Effects: Features integrated colorful lights. Long press the "M" button to turn the light on/off.
3. Product Overview
3.1 Clear Sound Quality

This image illustrates the internal design of the MEGUO A66 speaker, highlighting its 5W loudspeaker and two passive bass diaphragms, which contribute to its clear sound output. The components are shown in an exploded view, emphasizing the speaker's audio technology.
3.2 Portable Design

The image shows the MEGUO A66 speaker attached to a bicycle handlebar using its integrated lanyard, illustrating its compact size and ease of portability for outdoor use.
3.3 Extended Playtime

This image depicts the MEGUO A66 speaker in a home office setting, highlighting its long battery life with icons showing 12 hours of playtime, 3 hours of charging time, and a 1200mAh battery capacity, suitable for extended listening sessions.
3.4 Multiple Playing Modes

The image displays the MEGUO A66 speaker and illustrates its various playback options, including Bluetooth connectivity, TF card slot, USB drive support, and a 3.5mm Aux-in port, offering flexible music sources.
3.5 True Wireless Stereo (TWS) Function

This image shows two MEGUO A66 speakers wirelessly connected, symbolizing the True Wireless Stereo (TWS) function that allows users to pair two speakers for a more immersive and louder stereo sound experience.
3.6 Product Overview Video
This video offers a visual summary of the MEGUO A66 Portable Bluetooth Speaker, detailing its appearance, primary functions, technical specifications, user controls, and what you will find inside the product box.
4. Setup
4.1 Charging the Speaker
- Connect the provided Type-C USB cable to the charging port on the speaker.
- Connect the other end of the cable to a 5V 1A power adapter (not included) or a compatible USB port.
- The charging indicator light will illuminate.
- A full charge takes approximately 3-4 hours. The indicator light will change or turn off once charging is complete.
4.2 Powering On/Off
- To power on, press and hold the Power button until you hear an audible prompt and the indicator light turns on.
- To power off, press and hold the Power button again until you hear an audible prompt and the indicator light turns off.
4.3 Bluetooth Pairing
- Ensure the speaker is powered on and in Bluetooth pairing mode (usually indicated by a flashing blue LED).
- On your device (smartphone, PC, etc.), enable Bluetooth and search for available devices.
- Select "MEGUO A66" from the list of found devices.
- Once paired, you will hear a confirmation sound, and the LED indicator will remain solid blue.
- If prompted for a password, enter "0000".
4.4 True Wireless Stereo (TWS) Pairing (Optional)
To connect two MEGUO A66 speakers for stereo sound:
- Ensure both speakers are powered on and not connected to any other Bluetooth device.
- On one speaker (this will be the primary speaker), double-press the Power button or a dedicated TWS button (if available, otherwise refer to specific button functions).
- The primary speaker will search for the secondary speaker. Once connected, you will hear a confirmation sound.
- Now, connect your device to the primary speaker via Bluetooth as described in section 4.3. Both speakers will play audio in stereo.
5. Operating Instructions
5.1 Basic Controls
- Power Button: Press and hold to power on/off. Short press for play/pause (in Bluetooth mode).
- Volume Up (+): Short press to increase volume. Long press for next track.
- Volume Down (-): Short press to decrease volume. Long press for previous track.
- Mode Button (M): Short press to switch between playing modes (Bluetooth, TF Card, USB, AUX). Long press to turn the colorful light on/off.
5.2 Playing Modes
5.2.1 Bluetooth Mode
After successful pairing (see section 4.3), audio from your connected device will play through the speaker.
5.2.2 TF Card Mode
Insert a TF (Micro SD) card with WAV/MP3 audio files into the TF card slot. The speaker will automatically switch to TF card mode and begin playback. Use the +/- buttons to navigate tracks.
5.2.3 USB Flash-Disk Mode
Insert a USB flash drive with WAV/MP3 audio files into the USB port. The speaker will automatically switch to USB mode and begin playback. Use the +/- buttons to navigate tracks.
5.2.4 AUX Input Mode
Connect your audio device to the speaker's 3.5mm AUX input port using the provided 3.5mm audio cable. The speaker will automatically switch to AUX mode. Control playback from your connected device.
6. Maintenance
- Keep the speaker away from water, moisture, and extreme temperatures. This product is NOT waterproof.
- Clean the speaker with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Avoid dropping or subjecting the speaker to strong impacts.
- When not in use for extended periods, charge the speaker at least once every three months to maintain battery health.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Speaker does not power on. | Low battery. | Charge the speaker for 3-4 hours. |
| No sound. | Volume too low; incorrect mode; device not paired. | Increase volume; switch to correct playing mode; re-pair Bluetooth device. |
| Cannot pair via Bluetooth. | Speaker not in pairing mode; device too far; interference. | Ensure speaker is in pairing mode (flashing LED); move device closer; restart both devices. |
| TWS pairing fails. | Speakers already connected to other devices; incorrect pairing procedure. | Ensure both speakers are disconnected from other devices; follow TWS pairing steps carefully. |
| Sound distortion. | Volume too high; low battery; poor audio source. | Reduce volume; charge speaker; try a different audio source. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Name | A66 |
| Bluetooth Version | V5.0 |
| Output Power | 5W |
| Power Supply | 5V 1A |
| Speaker SNR | >75dB |
| Speaker Distortion Rate | <10% |
| Transmission Distance | 33 feet (without a barrier) |
| Music Play Time | 10 hours approx. (at 2/3 volume without light) |
| Charging Interface | Type-C |
| Charging Time | 3-4 hours |
| Product Dimensions (L x W x H) | 4.48" x 3.15" x 3.15" (approx. 11.4W x 8D x 8H cm) |
| Item Weight | 7.9 ounces (approx. 308 g) |
| Material | Plastic |
| Impedance | 4 Ohms |
| Is Waterproof | FALSE |
| Compatible Devices | Personal Computer, Smartphone, Tablet |
| Control Method | Touch |
| Audio Output Mode | Stereo |
9. What's in the Box
The MEGUO A66 Portable Bluetooth Speaker package includes:
- 1x MEGUO A66 Bluetooth Speaker
- 1x USB-C Charging Cable
- 1x 3.5mm AUX Audio Cable
- 1x User Manual
10. Warranty and Support
Your MEGUO A66 Portable Bluetooth Speaker comes with a standard brand warranty. For specific warranty details and to register your product, please refer to the warranty card included in the package or visit the official MEGUO website.
For technical support or customer service, please contact MEGUO customer support. You can find contact information on the product packaging or the official website.
MEGUO offers 365 days of friendly technical support and customer service.